Re: [PATCH v5 5/6] x86: Add Kconfig/Makefile to build hardware prefetch control driver

[Randy Dunlap]

On 6/7/22 05:05, Kohei Tarumizu wrote:
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 4bed3abf444d..3ee173483f9f 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1359,6 +1359,23 @@ config X86_CPUID
>  	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
>  	  /dev/cpu/31/cpuid.
>  
> +config X86_HWPF_CONTROL
> +	tristate "x86 Hardware Prefetch Control support"
> +	depends on X86_64
> +	help
> +	  This provides a sysfs interface to control the Hardware Prefetch
> +	  behavior for X86.
> +
> +	  Some Intel processors have MSR 0x1a4 (MSR_MISC_FEATURE_CONTROL),
> +	  which can control the hardware prefech behavior. If the processor

	                                 prefetch

> +	  supports this, the module can be loaded with the name x86-pfctl.
> +
> +	  Depending on the characteristics of the application, this register
> +	  parameters improve or degrade performance.
> +
> +	  Please see Documentation/ABI/testing/sysfs-devices-system-cpu for
> +	  more information.
> +

-- 
~Randy